Aset of objects (a "collection") can be implemented as an extension of an unordered list class. in addition to the existing operations for insertion, deletion and scanning elements, the "listset" class would need operations for unionwith( ), intersectwith( ), and subtract( ) methods.

The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object

Determine (a) the maximum thermal efficiency of reversible power cycles operating between a hot reservoir at 1000°c and a cold reservoir at 200°c and (b) the maximum cops for reversible refrigeration and heat pump cycies, respectively, between 28°c and 14°c.

Steam enters a turbine at steady state at 2 mpa, 360°c with a velocity of 100 m/s. saturated vapor exits at 0.1 mpa and a velocity of 50 m/s. the elevation of the inlet is 3 m higher than at the exit. the mass flow rate of the steam is 15 kg/s, and the power developed is 7 mw. let g 9.81 m/s^2. determine: a)-the area at the inlet, in m^2 b)-the rate of heat transfer between the turbine and surroundings, in kw c)-draw a p-v diagram for this process.